FrostList

When to Winterize Your Boat in Ames, IA

ON TRACK100 days until first 28°F freezeOct 19

The first 28°F freeze near Ames averages October 19 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by October 12. Plan for the early end: the one-in-ten date lands about 15 days before the median.

OUTLOOK

Typical first first 28°F freeze near Oct 19; local deadline about Oct 12. The live 10-day outlook loads here.

Local freeze dates for Ames

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 23Oct 8Oct 21
28°F (hard freeze)Oct 4Oct 19Oct 31
24°F (severe)Oct 16Oct 29Nov 10

NOAA station: Ames Muni AP · 2.9 mi away · 930 ft elevation.

Numbers for Ames come from Ames Muni AP, 2.9 miles away at 930 feet, where the medians fall 32°F by Oct 8, 28°F by Oct 19, 24°F by Oct 29. That hard freeze has landed anywhere from Oct 4 to Oct 31, a swing of roughly 27 days. Spring's last 32°F freeze clears around Apr 26. Snowfall averages 27 inches a year, first reaching an inch near November.

Expect the first frost near Oct 8 in Ames and the first hard freeze by about Oct 19. That first freezing night has ranged from Sep 23 to Oct 21, roughly a 28-day spread. On the spring side, the last 32°F freeze clears around Apr 26 and as late as May 9 — the green light for reopening water and de-winterizing. With around 27 inches of snow annually, plan for a handful of plowable storms each winter.

Your boat checklist

  1. Change the engine oil and filter while the motor is warm so contaminants leave with the old oil.
  2. Run the engine on antifreeze until pink fluid reaches the outlet, protecting the block and manifolds.
    Helpful gear: Marine antifreeze — Recommended pick
  3. Fog the cylinders with fogging oil as the engine runs down to coat internal parts against corrosion.
    Helpful gear: Fogging oil — Recommended pick
  4. Top off the fuel tank and add stabilizer to limit condensation and protect ethanol-blend fuel.
    Helpful gear: Marine fuel stabilizer — Recommended pick
  5. Drain the raw-water system, the livewell, and any washdown lines that can trap water.
  6. Remove the battery, charge it fully, and keep it on a maintainer over the layup.
    Helpful gear: Battery maintainer — Recommended pick
  7. Support the cover so snow and rain shed off, and leave vents so the interior can breathe.
  8. For an inboard or sterndrive, follow the manual closely — those blocks are the ones freeze claims hit hardest.

What to have on hand

Marine antifreeze
Propylene-glycol fluid rated for engine blocks and systems.
Recommended pick
Marine fuel stabilizer
Additive that protects ethanol-blend fuel over the layup.
Recommended pick
Fogging oil
Spray that coats cylinders against corrosion in storage.
Recommended pick
Battery maintainer
Keeps the cranking battery topped off on the trailer.
Recommended pick

What this means locally

Ames freezes about a week ahead of Ankeny (Oct 25) and about a week ahead of Urbandale (Oct 30) — a reminder that even nearby towns differ by days. Statewide, Iowa prep dates run Oct 11 through Oct 25, which is why Ames gets its own number rather than a Iowa-wide average. The same freeze also decides when to winterize an RV and store a motorcycle.

Other winter jobs in Ames

Every task below is dated to Ames's own freeze and snow normals.

Sprinklers → Oct 9Frozen pipes → Sep 23Ice dams → Oct 16Car battery → Oct 19Snow blower → Oct 25Sump pump → Apr 26RV → Oct 9Motorcycle → Oct 8

See the full Ames winter checklist, in order →

Frequently asked questions

At what temperature does a boat engine block crack?
Trapped water in an engine block or manifold can freeze and crack the casting once temperatures fall below 32°F and stay there long enough. Inboard and sterndrive blocks hold the most water and are the most vulnerable. Draining fully and adding antifreeze before the first hard freeze near Oct 19 is the protection.
Do outboards need winterizing?
Yes. An outboard should be drained so no water sits in the powerhead or lower unit, and the fuel system stabilized. Outboards self-drain better than inboards when tilted down, but fogging the cylinders and changing the gear oil are still part of a proper layup.
Fogging oil: is it necessary?
Fogging coats the cylinder walls and internal parts with a film that resists corrosion during months of storage. On engines that sit all winter it is cheap insurance against rust, especially in humid or coastal storage. Follow your engine maker's guidance on how to apply it.
How much does boat winterization cost?
A professional winterization varies with engine type and boat size, and inboards cost more than a simple outboard. Doing it yourself costs mainly antifreeze, oil, and fogging oil. Either way, the bill is far smaller than repairing a cracked block, which is the failure winterizing prevents.
Do boats in IA really need winterizing?
If temperatures reach freezing where the boat is stored, yes. Freeze claims are common in milder states precisely because owners assume they are safe and skip the step, then a rare cold snap cracks a block. Check the local freeze dates above and protect the engine before the first hard freeze.
When should I de-winterize my boat?
De-winterize in spring once the risk of a hard freeze has passed for your area. Reconnect and charge the battery, replace drain plugs, check hoses and clamps, and inspect the fuel system before the first launch. Reopening too early leaves the block exposed to a late cold snap.

Data: NOAA 1991–2020 normals via Ames Muni AP, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.